Are inactive is an expression that refers to a state of not being active, engaged or involved in any activity. Its antonyms include being active, engaging, lively, energetic, enthusiastic, and involved. Being physically active involves engaging in activities that keep the body in motion, such as exercising, playing sports, or walking. Being engaged refers to being mentally focused and committed to a task or project. Being lively and energetic indicates an infectious spirit or vivaciousness. Being enthusiastic is to possess a fervor or zeal for a particular topic, activity or project. Finally, being involved suggests being an integral part of a plan or project, playing an essential role or simply being present.